Maybe you hadn't thought about exercise as being part of a healthy diet.  But there is a direct relation between exercise and your digestive process:

• You need a lot of vitamins, minerals and antioxidants.  You will have difficulty getting enough from your food without becoming overweight, unless you burn the calories that accompany those nutrients by activity. 

• If you love to eat, you can do more of it without becoming overweight if you exercise or engage in vigorous physical activity regularly.

• Exercise causes wastes to move faster through the lower digestive tract, which is healthier for you.

• Exercise stimulates the gall bladder, making it less likely that the fat in your diet will trigger a painful gallstone attack.

• Food tastes a whole lot better after vigorous physical activity.

By the way, the best time to introduce a new food to your family is when they are really starving, and it usually takes exercise to create that kind of hunger.